There is a blind spot in our field of vision. Close one of your eyes, take finger around 20cm away from opened eye and move it left and right while looking at the same spot in front of you(so only finger moves).
At one point the tip of the finger disappears. And that spot doesn’t become black. It just disappears.
That is the same with blind. You have no sensation at all. It simply doesn’t exist. No black. Nothing.
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